Arab Israeli children pose with a pet snake at an amusement park in the northern Israeli city of Acre on August 31, 2011, as Muslims celebrated the Eid al-Fitr holiday which marks the end of the holy fasting month of Ramadan. AFP PHOTO/MENAHEM KAHANA (Photo credit should read MENAHEM KAHANA/AFP/Getty Images)

Photo: Menahem Kahana, AFP / Getty Images

Arab Israeli children pose with a pet snake at an amusement park in...

Arab Israeli children pose with a pet snake at an amusement park in... Photo-1840029.84460 - SFGate

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Kindergarten students nap at Grant School in San Francisco. April 26, 1971.

Photo: Dave Randolph, The Chronicle

Kindergarten students nap at Grant School in San Francisco. April...

Kindergarten students nap at Grant School in San Francisco. April... Photo-1840775.84460 - SFGate

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GUADALAJARA, MEXICO - OCTOBER 14: A general view as spectators hold up colored lights during the Opening Ceremony for the XVI Pan American Games at Omnilife Stadium on October 14, 2011 in Guadalajara, Mexico. (Photo by Scott Heavey/Getty Images)

Photo: Scott Heavey, Getty Images

GUADALAJARA, MEXICO - OCTOBER 14: A general view as spectators...

GUADALAJARA, MEXICO - OCTOBER 14: A general view as spectators... Photo-1825514.84460 - SFGate

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Mexico City -- The WMF and partners have been working since 2000 to restore and repopulate the Centro Historico's unique architecture, some of which is 7 centuries old.
credit: Ricardo Espinosa / MTB

Photo: Mtb, Ricardo Espinosa

Mexico City -- The WMF and partners have been working since 2000 to...

Mexico City -- The WMF and partners have been working since 2000 to... Photo-1826740.84460 - SFGate

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A Honduran high school student shouts slogans during a protest against the privatization of education on August 22, 2011 in Tegucigalpa. The government of Porfirio Lobo and the teachers' unions will start working on a new education bill to replace the currently in force which dates from 1966. AFP PHOTO/Orlando SIERRA (Photo credit should read ORLANDO SIERRA/AFP/Getty Images)

Photo: Orlando Sierra, AFP/Getty Images

A Honduran high school student shouts slogans during a protest...

A Honduran high school student shouts slogans during a protest... Photo-1827399.84460 - SFGate

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ST. PETERSBURG, FL - AUGUST 11: Pitcher Danny Duffy #23 of the Kansas City Royals and catcher Salvador Perez #13 collide while looking for a popup against the Tampa Bay Rays August 11, 2011 at Tropicana Field in St. Petersburg, Florida. Perez caught the ball. (Photo by Al Messerschmidt/Getty Images) *** BESTPIX ***

In this photo taken Oct. 14, 2011, Luna, a rare Leucistic Fox is shown at the El Paso Zoo in El Paso, Texas. The fox, named Luna, will be moved to the Spring River Zoo in Roswell on Wednesday. Officials don't know how the fox made it to the El Paso area. (AP Photo/The El Paso Times, Mark Lambie)

Ryan Ossa and James Barnes on the bus during their first day of kindergarten. Sept 7, 1983.

Photo: Gary Fong, The Chronicle

Ryan Ossa and James Barnes on the bus during their first day of...

Ryan Ossa and James Barnes on the bus during their first day of... Photo-1840777.84460 - SFGate

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TEL AVIV, ISRAEL - AUGUST 22: (ISRAEL OUT) A man cleans a room as Israelis break into and take over an abandoned public building as they protest against the rising cost of living on August 22, 2011 in Tel Aviv, Israel. Demonstrators continue to rally against the government's economic and social policies, which they argue have widened social and financial distance between the state's working poor and rich. (Photo by Uriel Sinai/Getty Images)

Mexico City -- The World Monuments Fund restored the early 20th century, Art Nouveau masterpiece, the Palacio de Bellas Artes, in the early 2000s.
credit: Ricardo Espinosa / MTB

Photo: Mtb, Ricardo Espinosa

Mexico City -- The World Monuments Fund restored the early 20th...

Mexico City -- The World Monuments Fund restored the early 20th... Photo-1826742.84460 - SFGate

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DES MOINES, IA - AUGUST 11: Voters put corn kernals into jars with their favorite Republican presidential candidates on the first day of the Iowa State Fair August 11, 2011 in Des Moines, Iowa. The candidates, including Mitt Romney, John Huntsman and Newt Gingrich, visited the fair ahead of Saturday's Iowa Straw Poll to greet voters and engage in traditional Iowa campaigning rituals. (Photo by Chip Somodevilla/Getty Images) *** BESTPIX ***

Dana Aisetewa and Tamara Richard enjoy their first day of school at Hollenbeck in San Francisco. (They're first graders but this goes in kindergarten slideshow.) Sept. 5, 1984

Photo: John O'Hara, The Chronicle

Dana Aisetewa and Tamara Richard enjoy their first day of school at...

Dana Aisetewa and Tamara Richard enjoy their first day of school at... Photo-1840778.84460 - SFGate

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GUADALAJARA, MEXICO - OCTOBER 14: A general view as spectators hold up colored lights as fireworks erupt during the Opening Ceremony for the XVI Pan American Games at Omnilife Stadium on October 14, 2011 in Guadalajara, Mexico. (Photo by Mike Ehrmann/Getty Images)

Photo: Mike Ehrmann, Getty Images

GUADALAJARA, MEXICO - OCTOBER 14: A general view as spectators...

GUADALAJARA, MEXICO - OCTOBER 14: A general view as spectators... Photo-1825516.84460 - SFGate

The bald eagle Spirit descends on a lure at Jordan-Hare Stadium on the campus of Auburn University in Auburn, Ala., Wednesday, Aug. 31, 2011. Officials at the Auburn Raptor Center train the raptors in their tradition of flying over the stadium on home football games. Auburn opens it's season this Saturday against Utah State. (AP Photo/Dave Martin)

Libyan rebels flash victory signs as they patrol a street in the capital Tripoli on August 22, 2011. Libyan rebels declared the "Kadhafi era" over after taking control of most of Tripoli, as jubilant fighters streamed into the capital to join battles near the strongman's compound. AFP PHOTO / FILIPPO MONTEFORTE (Photo credit should read FILIPPO MONTEFORTE/AFP/Getty Images)

SAN DIEGO, CA - AUGUST 11: Tight-End Anthony McCoy #85 of the Seattle Seahawks catches a touchdown late in the 4th quarter against the San Diego Chargers against during their NFL preseason game at Qualcomm Stadium in San Diego, California on August 11, 2011. Seahawks won 24-17. (Photo by Donald Miralle/Getty Images)

In this Thursday, Oct. 6, 2011 photo, Tracy Conley, of Holland, enters her dog Lucy, a Cavalier King Charles Spaniel, into the best costume contest at the pet contest dressed like a banana split as part of Pumpkinfest, in downtown Zeeland, Mich. (AP Photo/The Grand Rapids Press, Matt Gade) NO SALES

MOGADISHU, SOMALIA - AUGUST 16: Yasin Sudi carries his son Ayub Yasin, 6, at the Banadir hospital on August 16, 2011 in Mogadishu, Somalia. The hospital has been overwhelmed by new patients, as sickness spreads through camps for people displaced by drought and famine. The US government estimates that some 30,000 children have died in southern Somalia in the last 90 days from the crisis. (Photo by John Moore/Getty Images) *** BESTPIX ***

A Pakistani vendor smokes a cigarette while waiting for customers to sell his mangos, after breaking his daily fast of the holy month of Ramadan, on a roadside on the outskirts of Islamabad, Pakistan, Monday, Aug. 22, 2011. Muslims around the world are observing the holy fasting month of Ramadan in which they refrain from eating, drinking, smoking and having sex from dawn to dusk. (AP Photo/Muhammed Muheisen)

Photo: Muhammed Muheisen, AP

A Pakistani vendor smokes a cigarette while waiting for customers...

A Pakistani vendor smokes a cigarette while waiting for customers... Photo-1827402.84460 - SFGate

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AYUTTHAYA, THAILAND - OCTOBER 10: Thai mahouts ride their elephants through the flooded streets October 10, 2011 in Ayutthaya, Thailand. Around 200 factories closed in the central Thai province of Ayutthaya because of flooding, which is posing a threat to Bangkok as well. Over 260 people have died in flood-related incidents since late July according to the Department of Disaster Prevention and Mitigation. Some areas of the country are experiencing the worst flooding in 50 years, mainly in the centre, north and northeast. (Photo by Paula Bronstein /Getty Images)

AYUTTHAYA,THAILAND - OCTOBER 10: A Thai man smokes a cigarette as he sits in the flooded streets October 10, 2011 in Ayutthaya, Thailand. Around 200 factories closed in the central Thai province of Ayutthaya because of flooding, which is posing a threat to Bangkok as well. Over 260 people have died in flood-related incidents since late July according to the Department of Disaster Prevention and Mitigation. Some areas of the country are experiencing the worst flooding in 50 years, mainly in the centre, north and northeast. (Photo by Paula Bronstein /Getty Images)

GUADALAJARA, MEXICO - OCTOBER 14: Olympic gold medalist Jason Read carries the flag for Team USA during the Opening Ceremony for the XVI Pan American Games at Omnilife Stadium on October 14, 2011 in Guadalajara, Mexico. (Photo by Mike Ehrmann/Getty Images)

A pigeon pecks on patches of dried chilies on a street in Bangkok,... Photo-1840038.84460 - SFGate

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MOGADISHU, SOMALIA - AUGUST 16: A Somali boy displaced by famine and drought stands next to his family's hut in a makeshift camp on August 16, 2011 in Mogadishu, Somalia. Such camps have sprung up across the capital, as more than 100,000 people have fled to Mogadishu from countryside villages due to the crisis. (Photo by John Moore/Getty Images)

TEL AVIV, ISRAEL - AUGUST 22: (ISRAEL OUT) A man cleans a room as Israelis break into and take over an abandoned public building as they protest against the rising cost of living on August 22, 2011 in Tel Aviv, Israel. Demonstrators continue to rally against the government's economic and social policies, which they argue have widened social and financial distance between the state's working poor and rich. (Photo by Uriel Sinai/Getty Images)

An Indian woman looks at a rakhi, a sacred thread tied on the wrist, at a shop ahead of Raksha Bandhan festival in Ahmadabad, India, Wednesday, Aug. 10, 2011. Raksha Bandhan, the Hindu festival that celebrates the bond between a brother and sister, falls on Aug. 13. (AP Photo/Ajit Solanki)

Photo: Ajit Solanki, AP

An Indian woman looks at a rakhi, a sacred thread tied on the...

An Indian woman looks at a rakhi, a sacred thread tied on the... Photo-1828024.84460 - SFGate

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WINNIPEG, CANADA - OCTOBER 9: Zach Bogosian #4 of the Winnipeg Jets enters the arena as fans take photos before the game against the Montreal Canadiens in NHL action at the MTS Centre on October 9, 2011 in Winnipeg, Manitoba, Canada. The game is Winnipeg's first NHL regular season game in 15 years. (Photo by Marianne Helm/Getty Images)

Sheeps colored for identification are seen at an Afghan livestock... Photo-1825519.84460 - SFGate

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MOGADISHU, SOMALIA - AUGUST 16: A mother holds her child, sick with measles, at a camp for Somalis displaced by famine and drought on August 16, 2011 in Mogadishu, Somalia. The U.S. government estimates that some 30,000 Somali children have died in the last three months due to the current crisis. (Photo by John Moore/Getty Images)

Israelis and a dog look at a 20-year-old loggerhead sea turtle making its way to the Mediterranean Sea after being set free by the Israeli Sea Turtle Rescue Centre in the coastal town of Givat Olga, north of Tel Aviv, on August 31, 2011. Israeli fishermen had found the injured turtle about a month ago and it was treated until it was fit to go back into the sea. AFP PHOTO/MENAHEM KAHANA (Photo credit should read MENAHEM KAHANA/AFP/Getty Images)

A masked Mexican soldier patrols the streets of Veracruz, on October 10, 2011. Soldiers of the Army, Navy and members of Federal Police patrol the streets of the city as part of "Veracruz Safe Operation" after a rising tide of violence plaguing this touristic port city. AFP PHOTO/Yuri CORTEZ (Photo credit should read YURI CORTEZ/AFP/Getty Images)

People sit next to their family member killed in target killing in Karachi, Pakistan on Monday, Aug 22, 2011. A senior government official says gunmen have killed four people in Pakistan's largest city, taking the death toll in Karachi to 18 in two days. (AP Photo / Shakil Adil)

Photo: Shakil Adil, AP

People sit next to their family member killed in target killing in...

People sit next to their family member killed in target killing in... Photo-1827405.84460 - SFGate

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A broker looks at computer screens at the stock exchange in Frankfurt, Germany, Wednesday, Aug. 10, 2011, where the stock index DAX went down again. (AP Photo/dapd, Patrick Sinkel)

ADVANCE FOR USE SUNDAY, OCT 9 AND THEREAFTER - In a Wednesday, Sept. 28, 2011 photo, welcome home dog Jasmine stands between a soldiers feet at Camp Atterbury near Edinburgh, Indiana. Jasmine and other dogs are part of a program that brings in dogs to greet returning soldiers as they make their way through the demobilizing process. (AP Photo/Daily Journal Scott Roberson)

Photo: Scott Roberson, AP

ADVANCE FOR USE SUNDAY, OCT 9 AND THEREAFTER - In a Wednesday,...

ADVANCE FOR USE SUNDAY, OCT 9 AND THEREAFTER - In a Wednesday,... Photo-1826747.84460 - SFGate